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x in (-oo:+oo)
8/11 = (x-9)/9 // - (x-9)/9
8/11-((x-9)/9) = 0
(-1*(x-9))/9+8/11 = 0
(-1*11*(x-9))/(9*11)+(8*9)/(9*11) = 0
8*9-1*11*(x-9) = 0
171-11*x = 0
(171-11*x)/(9*11) = 0
(171-11*x)/(9*11) = 0 // * 9*11
171-11*x = 0
171-11*x = 0 // - 171
-11*x = -171 // : -11
x = -171/(-11)
x = 171/11
x = 171/11
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